Andrew "Blueblood" McMahon (April 12, 1926 – February 17, 1984) was an American Chicago blues bass guitarist, singer and songwriter. McMahon played bass guitar in Howlin' Wolf's backing ensemble for over a decade. He also backed a number of other Chicago-based blues musicians on record. His own best known tracks are "Lost in the Jungle", "Special Agent", "Potato Diggin' Man", and "Worried All the Time", which have appeared on several compilation albums.